/*
 * Copyright 2017 Huawei Technologies Co., Ltd
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package io.servicecomb.codec.protobuf.codec;

import java.lang.reflect.Type;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;

import com.fasterxml.jackson.databind.JavaType;
import com.fasterxml.jackson.databind.JsonDeserializer;
import com.fasterxml.jackson.databind.type.TypeFactory;
import com.fasterxml.jackson.dataformat.protobuf.schema.ProtobufField;
import com.fasterxml.jackson.dataformat.protobuf.schema.ProtobufSchema;
import io.servicecomb.codec.protobuf.jackson.CseObjectReader;

public class AbstractFieldCodec extends AbstractCodec {
    public static class ReaderHelpData {
        // 在reader返回的Object[]中的下标
        private int index;

        private JsonDeserializer<Object> deser;

        public int getIndex() {
            return index;
        }

        public void setIndex(int index) {
            this.index = index;
        }

        public JsonDeserializer<Object> getDeser() {
            return deser;
        }

        public void setDeser(JsonDeserializer<Object> deser) {
            this.deser = deser;
        }
    }

    // key为field name
    protected Map<String, ReaderHelpData> readerHelpDataMap = new HashMap<>();

    @Override
    public void init(ProtobufSchema schema, Type... types) {
        initFieldMap(schema, types);

    }

    private void initFieldMap(ProtobufSchema schema, Type[] types) {
        Iterator<ProtobufField> fieldIter = schema.getRootType().fields().iterator();
        for (int idx = 0; idx < schema.getRootType().getFieldCount(); idx++) {
            JavaType type = TypeFactory.defaultInstance().constructType(types[idx]);
            ProtobufField field = fieldIter.next();

            ReaderHelpData helpData = new ReaderHelpData();
            helpData.index = idx;
            helpData.deser = ((CseObjectReader) reader).findDeserializer(type);

            readerHelpDataMap.put(field.name, helpData);
        }
    }

    public ReaderHelpData findInfo(String name) {
        return readerHelpDataMap.get(name);
    }
}
